全文获取类型
收费全文 | 63858篇 |
免费 | 4681篇 |
国内免费 | 186篇 |
专业分类
耳鼻咽喉 | 826篇 |
儿科学 | 1752篇 |
妇产科学 | 1598篇 |
基础医学 | 10496篇 |
口腔科学 | 1692篇 |
临床医学 | 6061篇 |
内科学 | 12831篇 |
皮肤病学 | 967篇 |
神经病学 | 5978篇 |
特种医学 | 2739篇 |
外国民族医学 | 45篇 |
外科学 | 8248篇 |
综合类 | 546篇 |
一般理论 | 83篇 |
预防医学 | 4963篇 |
眼科学 | 1205篇 |
药学 | 4630篇 |
中国医学 | 171篇 |
肿瘤学 | 3894篇 |
出版年
2022年 | 383篇 |
2021年 | 1030篇 |
2020年 | 655篇 |
2019年 | 923篇 |
2018年 | 1130篇 |
2017年 | 783篇 |
2016年 | 920篇 |
2015年 | 1095篇 |
2014年 | 1350篇 |
2013年 | 2347篇 |
2012年 | 2999篇 |
2011年 | 3094篇 |
2010年 | 2251篇 |
2009年 | 1886篇 |
2008年 | 2797篇 |
2007年 | 2963篇 |
2006年 | 2930篇 |
2005年 | 2775篇 |
2004年 | 2832篇 |
2003年 | 2574篇 |
2002年 | 2645篇 |
2001年 | 2168篇 |
2000年 | 2216篇 |
1999年 | 1990篇 |
1998年 | 896篇 |
1997年 | 749篇 |
1996年 | 661篇 |
1995年 | 680篇 |
1994年 | 569篇 |
1993年 | 616篇 |
1992年 | 1455篇 |
1991年 | 1405篇 |
1990年 | 1341篇 |
1989年 | 1329篇 |
1988年 | 1116篇 |
1987年 | 1111篇 |
1986年 | 1060篇 |
1985年 | 967篇 |
1984年 | 703篇 |
1983年 | 663篇 |
1982年 | 465篇 |
1981年 | 443篇 |
1980年 | 387篇 |
1979年 | 632篇 |
1978年 | 378篇 |
1977年 | 360篇 |
1975年 | 377篇 |
1974年 | 414篇 |
1973年 | 349篇 |
1972年 | 342篇 |
排序方式: 共有10000条查询结果,搜索用时 6 毫秒
161.
162.
Edited by Lauren Dundes. Walnut Creek (CA): Altamira Press, 2003. 239 pages. $27.95, paperback, $75.00, hardback. 相似文献
163.
S H A J Tytgat D M Laman A M Rijken R Klicks A Voorwinde J M Ultee H Van Duijn 《European journal of vascular and endovascular surgery》2005,29(2):156-161
PURPOSE: To investigate whether a single pre-operative dose of 120 mg acetylsalicylic acid (ASA) decreased either (1) emboli rate, as detected by transcranial Doppler (TCD), during and early after carotid endarterectomy (CEA) and (2) clinical intra- and post-operative signs suggestive of embolism or increased bleeding tendency. DESIGN: Prospective, double-blind placebo controlled trial. PATIENTS AND METHODS: One-hundred consecutive patients were randomised to receive either 120 mg ASA (n = 48) or placebo (n = 49) by suppository on the night before CEA; three patients were excluded. Emboli were counted and expressed as emboli rate (ER). The incidence of bleeding complications was assessed. Surgeons were asked to indicate which patients had received ASA or placebo. RESULTS: There were no significant differences between the ASA and placebo groups in ER in the intraoperative and postoperative periods. ER higher than 0.9 min(-1) was associated with a significantly increased risk of complications (26 vs. 0%, P < 0.01). No extra bleeding complications were observed in the ASA group. Surgeon assessment of whether or not ASA had been administered had a sensitivity of 42% and a specificity of 70%. CONCLUSION: A single pre-operative dose of ASA (120 mg) did not reduce significantly the emboli rate during and after CEA and surgeons could not correctly identify whether or not ASA had been administered. 相似文献
164.
R. El Galta C. M. Van Duijn J. C. Van Houwelingen J. J. Houwing-Duistermaat 《Annals of human genetics》2005,69(4):373-381
In genetic epidemiological studies informative families are often oversampled to increase the power of a study. For a proband‐family design, where relatives of probands are sampled, we derive the score statistic to test for clustering of binary and quantitative traits within families due to genetic factors. The derived score statistic is robust to ascertainment scheme. We considered correlation due to unspecified genetic effects and/or due to sharing alleles identical by descent (IBD) at observed marker locations in a candidate region. A simulation study was carried out to study the distribution of the statistic under the null hypothesis in small data‐sets. To illustrate the score statistic, data from 33 families with type 2 diabetes mellitus (DM2) were analyzed. In addition to the binary outcome DM2 we also analyzed the quantitative outcome, body mass index (BMI). For both traits familial aggregation was highly significant. For DM2, also including IBD sharing at marker D3S3681 as a cause of correlation gave an even more significant result, which suggests the presence of a trait gene linked to this marker. We conclude that for the proband‐family design the score statistic is a powerful and robust tool for detecting clustering of outcomes. 相似文献
165.
166.
167.
Sequential 99mTc-hydrazinonicotinamide-annexin V imaging for predicting response to chemotherapy. 总被引:1,自引:0,他引:1
Sylvie Rottey Guido Slegers Simon Van Belle Ingeborg Goethals Christophe Van de Wiele 《Journal of nuclear medicine》2006,47(11):1813-1818
This study was undertaken to evaluate changes in relative (99m)Tc-hydrazinonicotinamide (HYNIC)-annexin V tumor uptake over time in patients undergoing chemotherapeutic treatment at baseline and at 5-7 h and 40-44 h after treatment initiation. Imaging results are related to clinical outcomes, as assessed with response evaluation criteria in solid tumors (RECIST). METHODS: We prospectively included 20 patients (11 men and 9 women; mean age, 59.8 y; range, 22-75 y) scheduled for chemotherapy (n = 19) or bisphosphonate treatment (n = 1). Curable disease was present in 5 patients. The other patients had metastatic disease and were treated in a palliative setting. Three of the 20 enrolled patients were excluded from analysis: 1 patient ultimately refused the proposed chemotherapy treatment; because of difficulties with the labeling procedure, 1 patient did not receive a pretreatment scan; and 1 patient presented with an allergic reaction (rash and nausea) to the (99m)Tc-HYNIC-annexin V formulation. The remaining 17 patients underwent 3 scintigraphic scans with (99m)Tc-HYNIC-annexin V: before treatment and 5-7 h and 40-44 h after treatment initiation. The tumor response was evaluated with RECIST and related to observed changes in the ratios of tumor activity to background activity for the largest known lesion; values exceeding 25% the baseline value on either the 5- to 7-h scan or the 40- to 44-h scan were considered significant. RESULTS: With the proposed sequential imaging protocol and a 25% change threshold, responders to treatment could be separated from nonresponders with a 94% accuracy (16/17 patients). CONCLUSION: Sequential (99m)Tc-HYNIC-annexin V imaging may allow for assessment of the response to chemotherapy within 3 d after treatment initiation. 相似文献
168.
Kim Mudd Mary Elizabeth Bollinger Van Doren Hsu Michele Donithan Arlene Butz 《The Journal of asthma》2006,43(8):597-600
Background. Medication adherence impacts healthcare utilization. Pharmacy records are useful to establish fill patterns. Objective. Use pharmacy records to establish medication patterns fill patterns for comparison to healthcare utilization. Methods. Pharmacy records of 175 children with persistent asthma were collected and compared to healthcare utilization. Results. Majority of subjects had significant healthcare utilization, low numbers of rescue medications, and poor controller medication fill rates. Those with more rescue medications had more healthcare utilization and more controller medications. Conclusions. Pharmacy fill patterns demonstrate few rescue and/or controller medication fills. Those with more rescue medications reported increased healthcare utilization despite controller medications. 相似文献
169.
170.